Calculation and analysis of axial connection stiffness of clamp band device

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Journal of Vibration and Shock ›› 2021, Vol. 40 ›› Issue (19) : 172-179.

KANG Shipeng1, LOU Yunfeng1, WANG Tianyi1, DING Qilin1 , WANG Xiaowei2

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Abstract

Here, a calculating method of clamp band connection stiffness was proposed. Based on considering deformation of interface frame, the influence of clamp block deformation of clamp band device (CBD) was added. The numerical calculation results obtained with the proposed method were modified using the finite element calculation results. This method was verified with tests. The calculated results obtained with this method were compared with test ones, and the calculation deviation was 3.1% to verify the correctness of this method. Based on this method, effects of clamp block deformation on clamp band connection stiffness were analyzed. The results showed that deformation of interface frame is the most important factor affecting clamp band connection stiffness, but considering clamp block deformation can improve the calculation accuracy. Furthermore, the method to improve clamp band connection stiffness through increasing the pre-tightening force in engineering was analyzed quantitatively. The example calculation results showed that the relationship between pre-tightening force and clamp band connection stiffness has obvious nonlinear characteristics: when pre-tightening force increases within 10%, clamp band connection stiffness increases in the same proportion; while the former increases by 10%-30%, the latter increases by 10%-20%; after the former increases by more than 30%, increase in the former can’t improve the latter.

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clamp band device (CBD) / connection stiffness / pre-tightening force / stiffness test

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KANG Shipeng, LOU Yunfeng, WANG Tianyi, DING Qilin, WANG Xiaowei. Calculation and analysis of axial connection stiffness of clamp band device[J]. Journal of Vibration and Shock, 2021, 40(19): 172-179

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